Pixhawk No GPS problem

My pixhawk operates well for 6 months, but yesterday, when I try to connect the MFD TeleflyPro to the yellow cable (Tx) of the ublox 7M GPS, never again recognized the GPS presence, even though all the lights in the GPS are lit (green one for pwr, and blue blinking one for GPS Fix), what happened?

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The yellow lead incredibily appeared to be ok, but internally the cable was cut, so after repaired it, all ok, GPS Fix very quick.

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